Its a branding iron for steaks on the BBQ:

M - Medium
W - Well Done

Should also be an R for Rare on on one of the other sides.

1970s Tuxedo Shirt XL

Nice trip down memory lane, its surprising how fast things have moved on, I remember merging the novell network storage space of several university colleagues to be able to get enough space to install the first version of Mosaic. We didn't have the kind of space to play with that I did back at my dorm (80Mb harddrive, no less!)

Although most things on that list are long since obsolete, there is still a thriving MUD community online.
Anyone looking for a richer and more imaginative gameplaying experience than the likes of World of Warcraft, I'd advise you to check out http://www.mudconnector.com and the current top mud www.3k.org (my personal favourite).